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RELFE BROTHERS' EUCLID SHEETS.

PROPOSITIONS 1–26, BOOK I, ARE NOW PUBLISHED IN A SIMILAR FORM TO THIS.

PROPOSITION XVIII.

The greater side of every triangle is opposite to the greater angle.

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RELFE BROTHERS' EUCLID SHEETS.

.

PROPOSITIONS 1–26, BOOK I, ARE NOW PUBLISHED IN A SIMILAR FORM TO THIS.

PROPOSITION XVII.

Any two angles of a triangle are together less than two right angles.

Let

be any triangle.

Then any two of its angles together shall be less than two right angles.

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In like manner it may be demonstrated, that the angles

are less than

two right angles, as also the angles

Therefore any two angles of a triangle, &c.

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